<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeStep - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- Tabs区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeStep" :tab-position="tabPosition"
                  :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleCateChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                      <!-- 渲染表单的Item项 -->
                      <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                        :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                          <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals"
                            :key="i">
                          </el-checkbox>
                        </el-checkbox-group>
                      </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                      <!-- 渲染表单Item -->
                      <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                        :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                      </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                      <!-- action 表示图片要上传到后台的API地址 -->
                      <el-upload
                        :action="uploadUrl"
                        :headers="headerObj"
                        :on-success="handleSuccess"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture">
                        <el-button size="small" type="primary">点击上传</el-button>
                      </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                      <!-- 富文本编辑器 -->
                      <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                      <!-- 添加商品的按钮 -->
                      <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览区域 -->
        <el-dialog
          title="图片预览"
          :visible.sync="previewDialogVisible"
          width="50%">
          <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 步骤条的选中状态
      activeStep: '0',
      // Tabs显示的位置
      tabPosition: 'left',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单数据对象的验证
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类信息
      catelist: [],
      // 商品分类级联选择器prop
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传 图片 的URL地址
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览的地址
      previewPath: '',
      // 控制预览框的显示和隐藏
      previewDialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
    },
    // 级联选择器change事件
    handleCateChange () {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 监听标签切换事件
    beforeTabLeave (activeName, oldActiveName) {
      // console.log('即将离开的标签名字是：' + oldActiveName)
      // console.log('即将进入的标签名字是：' + activeName)
      if (oldActiveName === '0') {
        if (this.addForm.goods_name.length === 0) {
          this.$message.error('请先输入商品名称!')
          return false
        }
        if (this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类!')
          return false
        }
      }
      return true
    },
    // Tab点击事件
    async tabClicked () {
      // console.log(this.activeStep)
      if (this.activeStep === '1') {
        // console.log('商品参数')
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品参数失败！')
        }
        // console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? []
            : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeStep === '2') {
        // console.log('商品属性')
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品属性失败！')
        }
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // console.log(file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath
      )
      // 3.调用数组的 splice 方法，把图片信息对象从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      // console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象 push 到 pics 数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add () {
      // console.log(this.addForm)
      this.$refs.addFormRef.validate(async vaild => {
        if (!vaild) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！' + res.meta.msg)
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps {
    margin: 15px;
}
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
